I usually buy the largest size Frontline Plus and give it out according to size of animal. I buy it on Ebay and it is much cheaper. They give you a siringe with a plunger, a little bottle and the encased Frontline Plus as you would buy at the store. I empty the encased stuff, one by one, as needed, into the little bottle. I keep it all in the fridge. Works for me. BUT I do it all year long! No breaks. NO FLEAS either.
P.S. I do the same for the cats, with cat worthy Frontline Plus.
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